Folding cloth filter for coffee percolators



Sept. 2, 1947. c. WEINBERG 2,426,720

' FOLDING CLOTHI FILTER FOR COFFEE PERCOLATORS Filed Dec. 1, 1945 anni/VE? Patented Sept. 2, 1947 UNITED STATES PATENT OFFICE FoLDING CLoTH FILTERFORCGFFEE" PERCOLATORS Charles Weinberg, New York, N. Y.

Application December 1, 1945, Serial No. 632,204

Claims, l'

The invention here Adisclosed relates to filters of the type used in coffeepercolators.

These have usually consisted of a covering of lter cloth secured about a frame or holder.

Such constructions have required the use of a draw-string'. elastic cord or equivalent, to close the cloth, usually in the fornrof a circular disc,- securely about the support.

Objects ofy the present invention are to provide a filter structure which will eliminate the need for drawstrings, elastic cord and the like, and which in fact can be secured in place without special fastenings of any kind.

Also, it is a purpose of the invention to provide a filter which can be easily and inexpensively produced, which can be easily and quickly applied and which when applied will be held securely in place through and by reason of its own formation.

Other desirable objects and the novel features of invention are set forth or will appear in the course of the following specication.

The drawing accompanying and forming part of the specification illustrates a present practical embodiment of the invention. Structure, however, may be modified as regards the immediate illustration, all within the true and proper intent of the invention as hereinafter dened and claimed.

Fig. 1 in the drawing is a plan view of the blank from which the filter is made, showing how the square of lter cloth is stitched or hemmed about two of its adjoining angularly related edges;

Fig. 2 is a plan view showing how three of the corners of the blank are turned inward and secured, leaving the stitched edges to form a deep entrance notch to the center of the article and a triangularly extending portion foldable inward as a flap for closing this open side of the pocket;

Fig. 3 is a plan view showing the support slipped into position in the pocket, and Fig. 4 is a similar view showing the ap tucked in to close thel pocket and secure the material about the support;

Figs. 5 and 6 are cross sectional views, as on the f lines 5 5 and 6-6 of Figs. 3 and 4, respectively, showing the support being slipped into position in the pocket and the pocket as finally closed and secured about the support.

As shown in Fig. 1, the blank from which the article is made is a square 'I of filter cloth. This square is stitched at 8 about two of its adjoining angularly related edges to provide the blank with two bound or finished edges.

The blank is then made up into the form of a (Cl. 21m-162') hat', open-sided, rectangular pocketv by folding the threeunfinished corners 9i, IU, II, inward to the common'- center and securing the contiguous meeting edges! by' stitching them together at This forms a` substantially square, flat pocket or bag of a size toreceive thedisc-like support or holderV I4", having adeep, V-shaped, triangular notch I4' at the open side,` extending from the full width clear to the center ofthe bag'.

Also withA this construction and arrangement, the fourth, projecting corner I5 has finished side edges, and the edges of the inwardly extending V-notch also are nished.

Figs. 3 and 5 Show how the support I4 can be readily inserted in through the wide-open side of the square pocket, and Fig. 6 shows how with the support fully in place the fourth, finished edge corner portion I5 can be folded in and tucked under the finished edges at the entrance notch to constitute a full and complete closure. In this nal relation the edges of the notch and the closure iiap lit closely about the stem I6 of the holder or support, to hold the filter in position on the support when the latter is reversed from the position shown in Fig. 6 and inserted in the percolator in the usual way.

While, because of its structure, the filter holds itself securely in place about the support, it can, when desired, be immediately and easily slipped off the support.

The device can be inexpensively produced, it packs in close, flat formation and is generally desirable for the purposes intended. Because of the absence of draw-strings, rubber bands or the like, it is easier to remove and keeps cleaner. Because of these factors it is practical to remove and wash, for repeated use, many times.

What is claimed is:

1. A coffee lter comprising a square of filter cloth having three of the corners of the same folded inward to a common center and secured in that relation in a at, three-sided rectangular pocket, the fourth corner left unattached and thereby leaving that side of the pocket fully open across the full width of the rectangle formed by the three connected corners and said free corner thereby constituting a closure flap adapted l to be secured by folding the same inward into the open side of the pocket so provided.

2. A coifee filter comprising a square of filter cloth having fold lines in the form of a smaller square with its corners at points bisecting the sides of the original square and providing four triangular corner aps outside said fold lines,

three of said corner aps being folded inward at over said inner rectangle and secured together forming a at three-sided rectangular pocket open across the side of the rectangle where the fourth corner ilap is located and the latter corner flap being foldable inwardly into said open side of the pocket to enclose a support inserted in the pocket to hold the filter distended. f

3. A coffee lter comprising a rectangular pocket of iilter cloth having triangular projecf tions of three sides of the same secured together along lines diagonal of the rectangular body of the pocket, the pocket being open at the fourth side and having a triangular projection at said fourth side foldable inwardly as a closure to said open side. f

4. A coffee iilter comprising a rectangular" pocket of lter cloth having triangular projec- Y pocket through said open side, said support having a stem extending out of the pocket at the inner end of said triangular notch and said fourth flap in its service as a closure extending inwardly into engagement with said stem.

5. A lter'comprising a square of lter cloth having two of the contiguous angularly related side edges stitched to provide a nished cornerY portion, the other three corners of the squarebeing folded inwardly to the common center and secured in this relation, forming a at, square pocket open at the side where the finished corner is located and provided at said open side with iinished edges extending as a triangular notch to the center portion of the open pocket and leaving the nished corner portion as a closure flap adapted to be folded inwardly intoY said` notch and beneath the finished edges of said notch. o

CHARLES WEINBERG.

REFERENCES CITED The following references are of record in the ille of this patent:

UNITED STATES PATENTS Wolcott 1 Aug. 14, 1945 

